Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7162aa4c9ae0b3…

MALICIOUS

PDF

41.3 KB Created: 2020-07-20 12:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8663d0ffb3be970a2396fa204a1f7c SHA-1: 79ebbeab4305eac0b562065489fea08516aa5766 SHA-256: de7162aa4c9ae0b3173e4c913dc33a5540e845920cf6ab33383ceca0f9048936
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning model and contains a high number of embedded links, many of which point to external PDFs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a link farm or redirection abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=math%20deductive%20reasoning%20worksheets
    • http://files.zagarefringe.com/uploads/1/3/1/4/131406985/nepofifabilof_bunogudoranij.pdf
    • http://files.augenius.org/uploads/1/3/1/0/131070911/8c22d400c.pdf
    • http://files.bellcurvededucation.com/uploads/1/3/1/4/131453268/3749dec80ed.pdf
    • http://files.libertyshelties.com/uploads/1/3/2/8/132816202/58eefa.pdf
    • http://files.bellcurvededucation.com/uploads/1/3/1/4/131453268/3749dec80e
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/72050001812.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/ponomuwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/28409981842.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/70003976405.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/30133290700.pdf
    • https://matesavabewa.files.wordpress.com/2020/07/xisinukisuzeta.pdf
    • https://sajovuvinar.files.wordpress.com/2020/06/lidote.pdf
    • https://jezodewetas.files.wordpress.com/2020/06/67697912697.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/97863427058.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/dodexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/juzukaxamufuletozorej.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/8654592684.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/53441178942.pdf
    • https://cdn.shopify.com/s/files/1/0438/4119/2101/files/kimezoseruxigawe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/bateresiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063fb.bin
2c3c7db512297a49f75cd961904581327f7c1be2ed711c51110f5fc21255e749		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FB 5272 bytes
font_01_sfnt_off000075f8.bin
4ec44cffdf860feef7e784bbb3b49f37c6268a16996e857b57fb7d7747e97d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F8 10204 bytes

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